Schedule II Schedule II (STATEMENTS OF OPERATIONS - Parent Company Only) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Equity in net income of subsidiaries and affiliates	[1]	$ 2,433	$ 1,019	$ 617
Total revenues		40,963	35,994	34,186
Administrative and other (income) expense		3,136	2,979	3,030
Business Combination, Integration Related Costs		0	0	23
Income tax expense		1,277	629	795
Total expenses		31,147	31,832	28,937
Net income		8,539	3,533	4,454
Chubb limited (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Investment income, including intercompany interest income	[2]	96	155	227
Equity in net income of subsidiaries and affiliates		8,514	3,457	4,307
Total revenues		8,610	3,612	4,534
Administrative and other (income) expense		56	55	65
Business Combination, Integration Related Costs		0	0	1
Income tax expense		15	24	14
Total expenses		71	79	80
Net income		8,539	3,533	4,454
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest		$ 6,020	$ 5,783	$ 7,521

[1] Equity in net income of partially-owned entities includes $233 million, $167 million, and $74 million attributable to our investments in Huatai (Huatai Group, Huatai P&C, and Huatai Life) for the years ended December 31, 2021, 2020, and 2019, respectively.

[2] Includes net investment income, interest income, and net realized gains (losses).